{
  const pdom = document.querySelector(".product");
  for (let i = 0; i < 20; i++) {
    document.querySelector(".product-list").insertAdjacentHTML("beforeEnd", pdom.outerHTML);
  }
}

{
  const adom = document.querySelector(".container > nav >a");
  const uldom = document.querySelector(".container > nav > ul");
  adom.addEventListener("click", function(event) {
    uldom.classList.toggle("open");
  });
}
